Method for structuring and dispatching digital city model library

Abstract

The inventing discloses a method for structuring and dispatching a digital city model library, relating to the field of plotting and geographical information systems. The method comprises the following steps: obtaining an original point cloud and an aerial photograph data of a city, establishing a framing three-dimensional model according to a standard plotting scale sheet range and the obtained point cloud and aerial photograph data so as to obtain respective framing three-dimensional models; dividing the contents of the respective framing three-dimensional model to obtain the layered framing three-dimensional models; blocking the data in the respective layered framing three-dimensional models according to a first predetermined regulation to generate an original model library; processing the datum in the original model library in a manner of grading treatment to obtain a graded model; naming the graded model, and accessing the named graded model into the original model library for management to generate a second model library; and dispatching in a paging manner, browsing and applying the second model. By utilizing the method, large-scale and fluent browsing and application of digital city high-precision mass data models can be realized.

Description

technical field [0001] The invention relates to the field of surveying and mapping and geographic information systems, in particular to a method for constructing and dispatching a digital city model library. Background technique [0002] The 3D digital city is an inevitable trend in the construction and development of the current digital city, and many cities abroad have built or are carrying out the construction of 3D digital cities. Model data construction tasks in digital cities are heavy, difficult, and costly. However, the amount of data in the digital city model is large, and the current computer hardware cannot meet the large-scale direct browsing of high-precision models with massive data. The number of model data and the amount of data have strict requirements before they can be browsed and dispatched in the computer. Domestically, such as Chongqing, Shenzhen, In the construction of large, medium and small cities such as Yantai, Ningbo, Wuhan, etc., the main gradin...

AI Technical Summary

Problems solved by technology

[0004] 1. Due to the limitations of computer hardware, it is impossible to support large-scale direct browsing of massive high-precision model data;

[0005] 2. Manually build a low-precision model to simplify the model with texture, the workload is huge, and it is difficult to apply to digital city construction; the obtained high-precision model does not have texture, which cannot meet practical applications; only the texture of the model itself is compressed. Hierarchical application, without automatic simplification of the number of model faces with texture, so high-precision model data cannot be widely applied;

[0006] 3. There is no model application case that uses the terrain model to generate a single-sided patch, resulting in huge terrain scene data, and it is impossible to browse the application on a large scale;

[0007] 4. The above three points lead to strict restrictions on the number of faces for model data construction

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